I just bought this truck for a great price. But the last two days it's been having some problems it's throwing o2 codes but it's fumbling at idle. At driving speeds it's fine just idle it wants to die. So my question is what could the problem be? I didn't think o2 sensors would cause this problem

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Check for vacuum leaks. Pcv hose etc.
That can cause your problem.
Make sure the oil cap is on.....
Seen that before.